Spark-plug.



J. J. MEYER. SPARK PLUG.

APPLICATION FILED HA3. 8, 1913. 1,07 9,790.

Patented Nov. 25, 1913.

WITNESSES v S INVENTOI? T J05 ATTORNEYS UNITED STATEEATENT OFFICE.

JOHN J. MEYER, OF YONKERS, NEW YORK.

SPARK-PLUG.

Specification of Letters Patent. Patented N 25 1913 Application filed March 6, 1913.

Serial No. 752,349.

To all whom it may concern:

wall B. The nipple A is provided with Be it known that I, JOHN J. Maren, a twp bores A and A, of which the lower citizen of the United States, and a resident of Yonkers, in the county of Vt'estehester and State of New York, have invented a new and Improved Spark-Plug, or" which the following is a full, clear, and exact description.

The invention relates to internal conr bustion engines, and its object is to pro- .vide a new and improved spark plug arranged to allow convenient and quick assembling and disassembling of the parts for removal of the electrodes for cleaning, repairing or other purposes, and to protect the assembled parts against injury by vibration or jars incident to the running of the engine.

In order to accomplish the desired re sultuse is made of a nipple screwing into the wall of the cylinder, a. shell of insulating material rcmovably held in the said nipple, an electrode held within the said shell, and a second electrode arranged in sparking relation relative to the said first-named electrode and in contact with the .id nipple, said second electrode being held exteriorly on the said shell and being removable from the nipple on removing the shell from the nipple.

A practical embodiment of the invention is represented in the accompanying draw ings forming a part of this specification, in which similar characters of reference in dicate corresponding parts in all the views.

Figure 1 is a sectional side elevation of the spark plug as applied, the sleeve and electrodes being shown in elevation; Fig. 2 is an enlarged side elevation of the lower end of the sleeve with one of the electrod s in position therein; Pig. 3 is an enlarged sectional side elevation of the other electrode; Fig. 4 is an enlarged side elevation of the retainer for locking the sleeve in position in the nipple; Fig. 5 is an enlarged sectional side elevation of the nipple; and Fig. 6 is a plan view of the same.

The nipple A is provided with the usual external thread A screwing into the wall B of the cylinder or other part of the in- *erzial combustion engine at which the ignition of the explosive mixture is to take [)liti'c. lhos nirk plu A is provided with a head A'-' or polygonal shape for convenient application of a wrench or other tool to portion A is somewhat less in diameter than the upper or outer bore A, and an annular seat A is formed intermediate the adjacent ends of the bores-A A". lVithin the bores A A of the nipple A extends a sleeve C of porcelain or other suitable insulating material, and within the sleeve (l is held an electrode D extending at its ends beyond the ends of the sleeve (l, the up er end being provided with the usual .astoning means E for attaching a conductor F to the electrode D. The lower end of the electrode D is in sparking relation with an electrode (i, and this electrode G is provided with a ring or band G encircling the lower portion of the sleeve (l. The upper end of the band G is provided with an outwardly-extending flange G seated on the seat A of the nipple A so to make firm contact with the nipple A thus providing engine contact for sparking. The top of the flangeG is engaged by a cushion H on which is seated a collar 0 formed integrally on the sleeve C and fitting into the upper or larger bore A. The cushion H is preferably made of superimposed washers of conducting and non-conducting materials, the conducting washers alternating with the non-conducting washers. v

A retainer I is connected with the upper end of the nipple A to securely lock the. sleeve C in position in the nipple A. The retainer I forms with the upper end of the nipple A a breech block type of joint to permit of quickly inserting the retainer l in the upper end of the nipple A by a turn less than a con'iplete turn, it being understood that for this purpose the lower portion of the retainer I is provided with a mutilated or interrupted thread 1 adapted to engage a correspondingly shaped mutilated or interrupted thread A" in the upper portion of the boreA (see Figs. 4, 5 and (5). The. retainer I is provided with a head I having recesses I in its peripheral face f r application of a rod, spanner wrench, or ol her tool for convenient unscrewing or screwing up the retainer 1 in the nipple A. The washer J is preferably interposed between the lower end of the retainer 1 on top of the collar (1 to'provide a cushion lJtlWOQIl the retainer and the sleeve to avoid injury to the sleeve C on screwingup the retainer l. The upper securely i'rew the nipple in position in the 1 portion of the retainer I is provided with a seat A.

gasket K encircling the sleeve C to provide another cushion between the sleeve and the said retainer.

It will be noticed that when the retainer 1 is removed from the nipple A the sleeve C can be readily pulled out of the nipple A and with it both electrodes D and G without disturbing the position of the nipple A in the wall of the cylinder. It is understood that when the sleeve is removed from the nipple A and with it the electrodes D and G then the latter'can be readily cleaned of soot or other extraneous matter or repaired in case it is necessary to do so. In replacing the sleeve C and the electrodes D and G it is only necessary to reinsert the sleeve C so that the flange G is seated on the seat A, and then the operator screws up the retainer I to securely lock the sleeve C in position in the nipple A.

By the arrangement described thevelectrodes D and G are held at all times in proper sparking relation with each other, and the sleeve and electrodes can be very quickly removed'for cleaning, repairing and other purposes, and replaced and securely locked in position. It will further be noticed by the arrangement set forth that a very good contact is had between the electrode G and the nipple A owing to the annular flange G2 being seated on the annular Injury to the parts incident to shocks and jars is prevented owing to the use of the cushions H, J and K.

The, spark plug shown and described is very simple and durable in construction and composed of comparatively few parts, not easily liable to get'out of order.

It will be noticed that the gap between the electrodes D and G can be examined and adjusted Without removing the nipple A. On screwing the retainer I up or down, the sleeve C resting on the cushionzH is caused to move up and down correspondingly aiid in doing so the electrode D moves up and down relative to the electrode G, but as the electrode D is made of suflicient length the necessary gap between the electrodes D and G is maintained.

Having thus described my invention, I

claim as new and desire secure by Letters onto the said lower portion of the said sleeve, and a cushion interposed between the said electrode flange and the collar of the said sleeve, and a screw retainer screwing in the said nipple against the said sleeve collar.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JpHN J. MEYER. Witnesses:

THEO. Gr H'STER, PHILIP D. ROLLHAUS. 

